Centinel System – Repair Manual – 005-096   Fuel Inlet Pre-Filter

The fuel inlet pre-filter is designed to protect the priming pump from debris from the fuel tanks.

Three versions of the fuel inlet pre-filter have been used on the ISX/QSX15 engine.

Early engines utilized a 300 micron pre-filter located in the fuel inlet to the Integrated Fuel System Module or a 36 micron filter located on the Integrated Fuel System Module.

Many of these Integrated Fuel System Module mounted pre-filters were removed due to the small area of the filter which become plugged easily. Remote mount automotive priming pumps contained a fuel pre-filter located in the priming pump manifold.

Later engines utilize a larger, serviceable 300 micron pre-filter located in a housing at the Integrated Fuel System Module fuel inlet.

Some engines are not equipped with a pre-filter.

Remove the fuel supply line to the Integrated Fuel System Module. Refer to Procedure 006-024.

Remove the fuel inlet fitting, pre-filter snap ring, and pre-filter.

Remove the fuel pump screen cap (36-micron screen).

Discard the screen.

Remove the large pre-filter from the Integrated Fuel System Module.

Disassemble the inlet pre-filter.

NOTE: The filter media is not removable from the inlet fitting.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

Use solvent to back-flush the pre-filter element.

Dry with compressed air.

Assemble the inlet pre-filter.

Install the pre-filter on the Integrated Fuel System Module.

NOTE: Do not use a new style inlet screen combined with an old style inlet screen. Excessive fuel inlet restriction will result.

Install the pre-filter, snap ring, and fuel inlet fitting into the Integrated Fuel System Module.

Install the fuel pump screen, compression spring, o-ring, and cap. Tighten the cap.

Install the fuel inlet line. Refer to Procedure 006-024.